DNA damage, homology-directed repair, and DNA methylation

PLoS Genetics
Concetta CuozzoEnrico V Avvedimento

Abstract

To explore the link between DNA damage and gene silencing, we induced a DNA double-strand break in the genome of Hela or mouse embryonic stem (ES) cells using I-SceI restriction endonuclease. The I-SceI site lies within one copy of two inactivated tandem repeated green fluorescent protein (GFP) genes (DR-GFP). A total of 2%-4% of the cells generated a functional GFP by homology-directed repair (HR) and gene conversion. However, approximately 50% of these recombinants expressed GFP poorly. Silencing was rapid and associated with HR and DNA methylation of the recombinant gene, since it was prevented in Hela cells by 5-aza-2'-deoxycytidine. ES cells deficient in DNA methyl transferase 1 yielded as many recombinants as wild-type cells, but most of these recombinants expressed GFP robustly. Half of the HR DNA molecules were de novo methylated, principally downstream to the double-strand break, and half were undermethylated relative to the uncut DNA. Methylation of the repaired gene was independent of the methylation status of the converting template. The methylation pattern of recombinant molecules derived from pools of cells carrying DR-GFP at different loci, or from an individual clone carrying DR-GFP at a single locus, was compar...Continue Reading

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Related Concepts

Dnmt1 protein, rat
Metazoa
DNA Sequence
Chromatin
DNA (Cytosine-5-)-Methyltransferase
Genotoxic Stress
Base Excision Repair
HeLa Cells
Proteins, Recombinant DNA
Recombination, Genetic

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